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JPS59161996

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DESCRIPTION JPS59161996
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
magnetic fluid seal speaker sealed with a magnetic fluid between a diaphragm and a magnetic
circuit. [Prior Art] Conventionally, in a π magnetic fluid seal speaker, the magnetic circuit is held
between a diaphragm and a magnetic circuit by a magnetic fluid, and the diaphragm is vibratably
held by the magnetic fluid. The magnetization intensity is made uniform over the entire
circumference of the vibration &. However, in general, the speaker is disposed such that the axis
of the diaphragm is horizontal, and the plane of the moving plate is suspended I, so the
magnetization strength of the magnetic circuit is as described above. If set uniformly, the
following permanent setting will occur from the relationship with the magnetic fluid and Luka.
That is, the attraction force applied to the magnetic fluid of the magnetic circuit and the vehicle
force applied to the magnetic fluid are opposite to each other above the diaphragm and in the
same direction below the moving plate. The combined force of these members is smaller above
the imaging plate, and greater than 10,000 of the imaging plate. Therefore, assuming that the
magnetic fluid of a necessary and light amount is filled above the diaphragm, the magnetic fluid
will be stagnant and stagnate in the case of the imaging plate. This means that the use of more
magnetic fluid than necessary is n11-1: smooth, unn-economical, and it spreads to the same side
as the magnetic fluid or scatters due to the action of the diaphragm, The speaker is easily soiled.
The imaging movement of the 'F7t% vibration 不 becomes uneven throughout, and distortion
occurs in the sound wave inside the bacteria. OBJECTS OF THE INVENTION The object of the
present invention is to provide a magnetic fluid wheel force which is uniformly distributed over
the entire outer circumference of the magnetic fluid volume distribution plate without the
drawbacks of the prior art. -To [Summary of the invention] In order to take a book DY for this
purpose, the present invention is to make the magnetic field strength of the magnetic flux path to
keep the magnetic flux # nonuniform, and the outer circumference 1 of the diaphragm 1 yc (1)
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The point that the attraction force by the magnetic circuit and the magnetic force applied to the
magnetic fluid are equal to each other in the straight line in the direction of the straight line. Do.
The present invention will now be described by way of example. FIG. 1 is a real 7I! Magnetic fluid
multil sby force according to the invention Fig. 2 is a cross-sectional view taken along the line AA 'of Fig. 1; 1 is a stationary base plate, 2 is a magnetic circuit, 2' is an annular magnet, 2 " Is an
annular soft magnetic material, 6 is a magnetic fluid, and 4 is an axis. In FIGS. 1 and 2, an
annular magnetic circuit 2 is provided on the outer periphery of the circular 4-disk vibration @ 1,
and the magnetic fluid 6 is sealed between the moving plate 1 and the magnetic circuit 2. ing.
The magnetic circuit 2 consists of an annular magnet 2 'and two annular soft magnetic bodies 2
". The annular magnet 2' is magnetized in the direction Vc of the axis 4 and the annular soft
magnetic bodies 2" are It is prepared. Therefore, the attraction force F acts on the magnetic fluid
3 in accordance with the magnetization intensity of the annular magnet 2 ′, and the attraction
force F causes the magnetic fluid 6 to be attracted n in the direction of the magnetic circuit 2.
The aperture diameter of the imaging plate 1 is fine even if the diameter of the inner surface of
the magnetic fluid 3 is large, and the imaging plate 1 can vibrate in the direction of the axis 4. 1
shows the state in which the axis 4 of the photographing & 1 is horizontal, the upper side of the
photographing plate 1 is the upper end direction of the paper surface, and the lower 70,000 of
the stationary rod 1 is the lower end direction of the paper surface. By the way, the force G acts
on the magnetic fluid 6 everywhere, and this magnetic force 3 [overall force is a combined force
which is the vector sum of the attraction force F and the gravity G by the magnetic fluid 2] .
Therefore, the magnetization strength of the magnetic circuit 3 is not equal to that of the
magnetization circuit of the magnetic circuit 2 in the direction of the outer periphery of the
magnetic circuit 2 so that the synthetic force is equal in size in the direction of the magnetic
circuit 2 over the entire outer periphery of the moving plate 1. The magnetization intensity of the
magnetic circuit 2 is made higher as the upper side of the perfume 1 is made more uniform, and
the magnetization intensity of the magnetic circuit 2 is made smaller as the lower side of the
moving plate 1 is made more uniform. Assuming that each point is P and Q, for example, for the
uppermost soil point and the lowermost point of the moving plate 1, the magnetic fluid 3 VC in
the vicinity of the points P and Q has the same monthly enjoyment G of downward force.
Although acting, such gravity G pulls the magnetic fluid 3 from the magnetism [o circuit 2 in the
vicinity of the point P, and conversely pulls the magnetic fluid 37 in the magnetic fluid 37 [path]
2 in the vicinity of the point Q It's upset. Therefore, the attraction force of the magnetic circuit 2
acting on the magnetic fluid in the vicinity of the point P is closer to Fu and AQ than the
magnetization intensity of the portion facing the magnetization intensity of the magnetic circuit
20 points PK opposite to the magnetization intensity of the point 2 Assuming that the attractive
force of the magnetic circuit 2 acting on the magnetic fluid 5 in F is Fd, the combined force (F ・
-G) and the combined force (FdGG) are made substantially equal. Thus, the magnetization
intensity of the magnetic circuit 2 is made uneven along the outer periphery of the moving plate
1, and the force acting on the magnetic fluid 3 over the entire outer periphery of the moving
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plate 1 is approximately equal to the magnetic circuit 2 To have the direction of Therefore, the
magnetic fluid 3 is uniformly attracted in the direction of the magnetic circuit 2 over the entire
outer periphery of the diaphragm 1, and the amount distribution of the magnetic fluid sealed
between the imaging plate 1 and the magnetic circuit 2 becomes uniform. In order to make the
magnetization strength of the magnetic circuit 2 uneven as described above, the radial direction
of the annular magnet 2 'and the annular soft magnetic material 2' 'is made different in the outer
peripheral direction of the moving plate 1 That is good.
Even if the width of the annular magnet 2 'or the annular soft magnetic material 2' 'is 4 or less,
the magnetic properties of the annular magnet 2' may be changed stepwise, or even if the
material of the annular magnet 2 'is changed according to the field P9T.pi. The magnetization
intensity of the circuit 2 may be nonuniform as described above, and one ring magnet and two
ring soft magnetic members may be one stage, and the number of stages may be changed as two
stages or three stages depending on X case. Even if the intensity of magnetization is changed or
the intensity of magnetization is changed J: V '-0 [Effects of the invention] As described above for
fishing, according to the present invention, the axis of the imaging plate is When mounted on a
speaker Unisite 'Y bubble or the like so as to be horizontal, the force applied to the magnetic fluid
becomes uniform in the direction of the magnetic circuit throughout, and the magnetic fluid is
attracted to the magnetic circuit all around uniformly. Sealing between the moving plate and the
magnetic circuit by quantitative VC with just enough b-like fluid While preventing the diffusion
and scattering of the magnetic fluid to the periphery, the vibration of the entire imaging unit is
also uniform, and no φ is generated in the generated sound wave, so that the conventional
treatment for the upper eyelid is performed. The Δ-filter can provide a magnetic fluid-sealed
speaker with excellent function except for wide-illumination.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a front view showing an embodiment of a magnetic fluid seal speaker according to the
present invention, and FIG. 2 is a cross-sectional view taken along line A-A 'of FIG.
DESCRIPTION OF SYMBOLS 1 ... Shooting board, 2 ... Magnetic circuit, 2 '... 1st cyclic | annular
stone, 2 "... cyclic | annular soft magnetic material, 3 ... Magnetic fluid, 4 ... Axis
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